E53 3.0d 2006 Transfailsafe trifica

[Fatjohnny]

Hi, new to here. A rather complicated problem, for me anyway. So, in August dsc/4xr light came on, plus Transfailsafe. To note, good battery, Sas changed and calibrated, new alternator, new transfer box actuator. BMW had the car for diagnosis. Changed the electronic connector on the gearbox. 2 days later, same symptoms. They now say, transfer case, but I'm not convinced. Yesterday I removed fuse 46 to deactivate the transfer case. In theory car should drive in 2wd, albeit with warning lights. Car drove normally but the dropped into Transfailsafe. Any ideas would be gratefully received.